Also, in my personal experience, New Belgium bottles are easiest to delabel - no OxyClean needed, the labels literally fall off in hot water after about 3 minutes. Soak, slide, drain, dry. It's faster than a cheetah chasing a hare covered in delicious bacon.

I use oxyclean and hot water, which takes anywhere from a few hours to a couple days, but usually the labels just fall right off.

Some bottles though still leave behind their adhesive on the glass. I have found that the easiest way to remove it is with a "Magic Sponge."

(There are several brands including big box store generics, and they all work fine.)

Sometimes, depending on the hardness or softness of the water there will be a "scale" or white crusty dried soapscum that may be difficult to remove even with lots of rinsing. I have found that soaking them in Starsan at regular dillution dissolves it. Other brewers have recommended a weak solution of vinegar and water. Both are weak acids, and they do the trick.

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I let some sierra nevada bottles sit in an oxyclean solution for a day and when I pulled one out to clean off with a scotch brite pad the oxyclean had left scale all over the bottle. I was able to scrub it off the outside but no way was I going to get it off the inside. Had to toss the whole 6 pack in the trash.

Hot water and a sponge. I fill each bottle with hot water and let them sit for a minute or so as I fill others. The water softens the glue and then just use the scrubby side of the sponge to get it off or peel it off with your fingers. Doesn't take long, BTW I use this for SA bottles primarily and works great!